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35 lines
1.4 KiB
35 lines
1.4 KiB
1 year ago
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// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2015 Alec Jacobson <alecjacobson@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#include "directed_edge_parents.h"
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#include "colon.h"
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#include "setdiff.h"
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#include <algorithm>
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template <typename DerivedE, typename DerivedP>
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IGL_INLINE void igl::directed_edge_parents(
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const Eigen::MatrixBase<DerivedE> & E,
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Eigen::PlainObjectBase<DerivedP> & P)
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{
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using namespace Eigen;
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using namespace std;
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typedef Eigen::Matrix<typename DerivedE::Scalar, Eigen::Dynamic, 1> VectorT;
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VectorT I = VectorT::Constant(E.maxCoeff()+1,1,-1);
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//I(E.col(1)) = 0:E.rows()-1
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I(E.col(1).eval()) = colon<typename DerivedE::Scalar>(0, E.rows()-1);
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VectorT roots,_;
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setdiff(E.col(0).eval(),E.col(1).eval(),roots,_);
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std::for_each(roots.data(),roots.data()+roots.size(),[&](typename VectorT::Scalar r){I(r)=-1;});
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P = I(E.col(0).eval());
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}
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#ifdef IGL_STATIC_LIBRARY
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// Explicit template instantiation
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template void igl::directed_edge_parents<Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, 1, 0, -1, 1> >(Eigen::MatrixBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> >&);
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#endif
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